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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e379704ac481a546fda29d0ae7a8589f4aa9dbd421992f9e31230dcbce793a' 
  AND token = '4D6Lv8w0mwGhIGYm1rwNlZ1T94/+0gu/nPASRRGK9kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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