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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c910e98d58195b9950aa820bda0a24bc6c62be8cf6ba10be4cfe3601902735' 
  AND token = 'llHcetbP00U95PQA6VSsPMXDKXkbrNATurDPD0n054U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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