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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3303283f2252750c66800e56fe6e9ac84b2a0c6b2f9f7b0689188b952419d7a' 
  AND token = '1Ae4nClwxScyD6uaPpcoIxwVDPzm7Z6gW0glHnmCZkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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