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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a987fe1d636bc54cb6a35d7d05f3090f9acce37fbac267674976dd225c348c' 
  AND token = 'L7WdY/FsI7snF1uLt3DMAF5+69Zs1OB5c2LOv+rh9gw=' 
  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"
    }
  }
}