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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7feed3a2332aa4001dc44fffbbd48aff4411f65628198fe3f549eab80b4e2cd4' 
  AND token = '0g/oU5fPcQTWg8wV6j+1UkWkzuhy0OPIpn2LeSWS5Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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