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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c189770c399344b8b4baa1823cdc7c94dab258333d43eb8d7130e270d600de2e' 
  AND token = '4p3Cd2PrGf0p9kjVt82SCA4M2B89H8QcwkH760dobBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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