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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5876cc3f7bafcc86809a616b01323a98c8a34bd37abe09f2b3cffd24274097d' 
  AND token = '/qOgiwYEIfrKt2IZRd9wrFpPLmm6ps3RdnOWcYzfiCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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