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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a126fe3c7abe4e04cc2f3e9a4430fe670b51a0e6fb467e56471ada0cfd4911fb' 
  AND token = '8DYIrXo3LO9VB4nm5RO+Rbc4JjsE00e3zKLZPwmHEKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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