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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cef97d1007c2b22a23e6bfd21dc31d7150f6cedc19d3323c8fef85c24846b7' 
  AND token = '1zfp/Ezc/CEyYL6EIhq2wg+zJ3lKMeGZbxzx3cT0QMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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