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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94484a6f154972e66416e38840ad009e851063fb53783fa2d1ba145e12b98b4e' 
  AND token = 'v1b2HG76XpebD5lEY0MnLLWvC17lCc51Vz5kjlHNVUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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