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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783a836f87f0eae6b0414a19ddbc867c4d5c90c2c78967c0946d75b460e875aa' 
  AND token = 'rqK48oi2wvTk7TPYEGMQq+Us4El/Kw/+d5jVSurinQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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