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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e785d2c774c665c85ae7ab73aacbfc35257287694f4b51b69f46160979770bc0' 
  AND token = '6V3rQZqbFQmt9efQnRDG8eB4kRRRaxVQHxpHQC1Z+q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}