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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f33fca20f74fd33a11f73eef7c52f2a1ff1da77129450e9a3474ee3331d2ff5' 
  AND token = '6R8Sfb5V890q03bh2PcZtxBcID7jjIVYJFmMw4CHzug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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