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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd104449a87be1c3e519792cbd308c67881f2ebd881f2ce632a4ecce6e97c691c' 
  AND token = 'Hzk4rBxRqT9YcCa50/6sz/irThd+2oDhGT74/m8qfd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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