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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30769ab1f40e1f061c9565706bf975c8f425a42343912f5a6e035badc4ba03c1' 
  AND token = 'oGHwa8Yn9tHFu+W46MzAi4KcYuFhpYQRF+o+iw6kjqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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