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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebcfb76aa59d538ccf39caef6e6086098e5076bc9e98d9311b6cc6bd77864f6e' 
  AND token = 'fv48rPUkWMaFsxEvUw2jq9o0gRWmrHa17+FM2jsK2ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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