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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2cf9e72211178436f69c0e42579371164a64b9acc224f735cb30defa9afb00c' 
  AND token = 'WiLDPx2iyq6Wu2SDfR9akjdncAbuu2+46JYU5Iz/AVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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