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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0c6596feecadca48cc94b78ee3ff06361fb3605f64ee5de7d520d0566df6e4' 
  AND token = 'myuozP8vOm6JYidWiZfViLz6GsTF+MV9EHfgMouUC/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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