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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c38e4c5a6103c3e0de1b0ea26bb8d4b1b71c66743afb43c807a744fe4d850a2' 
  AND token = 'AgMlOyB49dEb36RxfGDLPj37fti+3Xwzd7+bAXPhbGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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