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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b44ee3b4590b94539f0aaa6a653baedcc16199cecbc2b2971db8b0c0fca3c3' 
  AND token = 'I61ovAkEUrK6uW3F8TMTFwzGmIwy6SClujfFnQJwbCA=' 
  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"
    }
  }
}