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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358a1c81ce04fcca474b44dcea88a893e5d832cd7b13088a4d0b59a11daa8587' 
  AND token = 'tN4YhfoIzW7QlsUNUjF986v4qd4cVSOn5gJVXBYfs8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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