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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da22d7f07454df4459ca3319f844448ce85fd9e64309116c3fb81358003ec4c7' 
  AND token = 'DXiVHqWk78ZU2avLTpDSiEfQUPTTOUDBqB4/yIchM/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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