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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9141f83474b6c636a1f7da59256fd81b73f09afd796759312eeea26261977fd9' 
  AND token = 'f1zLVy3y17+ZOtKqS9sekOwveM6cZCYWEemYtE0+Tog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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