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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831fd43823d88a685da7bd3a5b9b5bd5f0d4dda20d2ff9518257b29f7982335f' 
  AND token = 'f3ANyFypFmQSdhdSRuX0hHoZCwYmxEa2L9R+Jr2CZ7c=' 
  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"
    }
  }
}