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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e127ceb121d01af37d49ae48dff3a57fca042c8830e8228018dc731b27e453d1' 
  AND token = 'cKg03ugQMzQmaHmk5ubdALOJUuuahQxBLimWD6ZX5ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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