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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef7298e6b546310042a9dd2720a4bb2852c95b68140b1b2814cfa2321033664' 
  AND token = 'TUGvtGPQuDL8AWsLOm+z1+A4Cq6cdn2Som5sCbJ3NcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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