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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f09aa9bd938564873b8773bea74c4d5a6aaddf3893d8d1d98838a4307ee4ad9' 
  AND token = '9hEiNOFuwtlnUfX8Ojf1YHYVDFH4USr+13OHIUGhZwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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