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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a46ec04d233537f98e2c6fa7544b4eb96ae55c088fa7ef090fa14bc4698e1b' 
  AND token = 'ZOGXJ5iwyU/sWo9nTSert/c7llKKY6i2RQaxc9il2zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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