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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98d893b851e7f70308cd0320c4b2279d9f10b2dd3ef8ad6726037f0cf209abf' 
  AND token = 'WDvyi4BEIaQCwBrpraBOOseBu/dnNZ6i+IkRzV2S6vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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