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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335b3563ab312e69694ad79aade7eb620b94c8f7c6a54ce206014c3b71c64a4c' 
  AND token = '8VG+znT29hM5LZcUSCw9uCXbuJtS/T8euk0fLDKjkLo=' 
  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"
    }
  }
}