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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2672424ed152e544af5411abbae4387c92d4c92cf6610c6120eb4e384c8e4e1' 
  AND token = 'ZKi9B4EmUoLBBVuxL/D36v/gI3xlNGFxfzmf64PqdxQ=' 
  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"
    }
  }
}