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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe435d800c58af5ab96f62edb510a41a5a228e58b5ab3443ea78aa6d89924f8' 
  AND token = 'pFgy4byaJL7BcLp+x6cZ86Y2iMRb3oAYFV30ID3XPL8=' 
  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"
    }
  }
}