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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f912c06e2d9bb68ca3569311e478980414fd17f29a18cccfab6f11a09db8ac20' 
  AND token = 'Ip+p51BonB1jg6M5VUURkNdwAz4tXEo9gXtXJve5QcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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