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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8307e310aa0e98c53eed618effbba639741491f29d65fa46da01346bccca77ff' 
  AND token = 'Pj0y2E5e39VUj/MwCHV6J8IyCOeFa9d6In7tjFlHXkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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