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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38907cec9bc81a991b07aec181158a23a2aeb57751b7fb9d8285e7ed905e682e' 
  AND token = 'nR5SPlGM5h0293JOstusRjgWPdcW7S3+TT4cIuElvZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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