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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05103fd73b0a083bd45f715e0aa5aeca0f4efd707cc3a959bc42397e74720bfc' 
  AND token = 'uc1UHglEj16vMiDKHv7siwb8ITbwJGLAvBzGJ/L6Jcg=' 
  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"
    }
  }
}