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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f203c4e1df9902b85e7f7c2db4855e3f7194ee570085858e4a1cfc1d3c8b0487' 
  AND token = '1uKk2rp8xNazh2pnyb6UpKZ6tfkM15jehPse82fgey8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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