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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96b62bb34328351d5ade0a51ee71e8fef78c6272d7af54042bd610248e27eba' 
  AND token = 'UBKG9e/CfW2c2Vbcm1HniwJpTNu3r+2gP5V1l6Uuc0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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