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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c14c81e28ce566a79b3b00a393cb013f2f8f0c186aea3713ae8abc7930c503' 
  AND token = 'nJacY6lw5hj0jWMagF+cfklTjJfF5mqm2J5XfwAjnAQ=' 
  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"
    }
  }
}