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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f7d9b25403eecb4e4547909c6dc0d85c4243f90a7776cc1426ffe1217e8142' 
  AND token = 'eXi3N1/C9SCIZUEmGUi0ZJgJ76kcezVWO7+Etb/HHrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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