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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9ae0401b7bb30cd41b34295bd78b20beb43782a890e2dfbee47d324652a09d' 
  AND token = '37r/f4v7UydmbGyC5J0X5/GxGzLXOQ/rw0xcD2qN/hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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