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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4acb38409def8c363d71187780e32cf2b98fd004b80b799c18f5b38fdd6e22c' 
  AND token = '8FscFoGtJV5UORRCx2UqTUYpxC9KIw723aA51suGqiY=' 
  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"
    }
  }
}