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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa29644292f0aa5f75427fb102f0bf262cebd02e85b0d5f74ac30a592ddc1d4' 
  AND token = 'd+4ZqXJj2DCshZPFjFUtgCS9NyE+Jm0Nn4twgJYX/ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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