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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff07c80c1c5649e319f3ea3ca894a64e4d6eb39aef375707a91dd7f2a0c8e14' 
  AND token = 'C6Ag89aRbEcu3mufTx98/grfeBlzvwDcQXJEDFlkJiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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