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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c836ea25d315b23ea1082d3ea9983760e4dc738966668de641a118ebe6b47a2e' 
  AND token = 'lOFgjiR2HncI9N99JHaq0MwtecAe6xzS2U+RTiesMf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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