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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d48e1b1045f44a6b1e4a7e32c2278fd556c1c0638cfeb78e6e58f24ea43e84c' 
  AND token = 'cIPX1FH9GSJK8wdoraKq/lUW7Slq83zd8ZOWFEpNwxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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