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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa78b035676765f8c4fa82deed213d4eb4a36f4f42a2cdebb38e4315cf86890e' 
  AND token = 'ZL+l2Dl8mzvve3QmZ0KOtFyk7R2hYQNYUJJj2K3R5o8=' 
  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"
    }
  }
}