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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055ef367aefb9dab1d43312c7985d5455e3854623a7fd9c6f4616ad6859d7be0' 
  AND token = 'yd/InZt7nMHGg69RsmdU4d5RmsCYkDMmDX/RguG7KN0=' 
  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"
    }
  }
}