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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adaaa70ec4e57d17c2e808dae7d6ef068a9ddf7b8564ee680bd5d97cdc04fb69' 
  AND token = 'dvI48JrQcS2HNSG3WSNQYJFthykIQfxrL2cr/A5BnUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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