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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f6f8516d523ad0a53bebd6ac8395c8241711b3601e42ebe900c95e50fcb199' 
  AND token = 'B7F6ncg+bgi+J7qiNo0m0B36Cw5CdSzEnoSazpsPZ8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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