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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb2d0d6a6d6b71782ef9815ee97e83f43853d723b7e769cb390eccaeb42960d' 
  AND token = 'w/9QKWL3EW6HCSZ46Oo7ho323Dxn/xl07pUzTvVTovA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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